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Finding the Third Proportional to 515 and 1,123

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Solution

The third proportional to 515 and 1,123 is: 2,448.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    515 : 1,123 = 1,123 : x
  2. Step 2: Convert to fraction form
    515/1,123 = 1,123/x
  3. Step 3: Cross multiply
    515x = 1,123 × 1,123
  4. Step 4: Simplify right side
    515x = 1,261,129
  5. Step 5: Solve for x
    x = 1,261,129/515
  6. Step 6: Final answer
    x = 2,448.79

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Why These Related Problems?

These problems maintain the same ratio (2.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.